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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities    
Net loss $ (35,533) $ (8,280)
Reconciliation of net loss to net cash used in operating activities:    
Depreciation 129 5
Stock-based compensation 4,689 450
Amortization of premiums on investment securities, net (77) (71)
Non-cash interest expense   12
Non-cash interest expense—related party   26
Net change in operating lease right-of-use assets and liabilities-related party 19  
Change in operating assets and liabilities:    
Prepaid expense and other assets (1,017) (341)
Deferred revenue   (201)
Accounts payable and other liabilities 2,418 1,430
Accounts payable and other liabilities related-party (5) (1,843)
Other long-term liabilities   144
Net cash used in operating activities (29,377) (8,669)
Cash flows from investing activities    
Purchases of investment securities (86,261) (55,589)
Proceeds from maturities of investment securities 34,155 22,104
Purchases of property and equipment (1,538) (76)
Net cash used in investing activities (53,644) (33,561)
Cash flows from financing activities    
Proceeds from initial public offering, net of issuance costs 254,271  
Proceeds from issuance of convertible preferred stock, net of issuance costs 124,712 44,731
Issuance of common stock through employee stock purchase plan 194  
Proceeds from the exercise of stock options 34 1
Proceeds from the issuance of notes payable, net of issuance costs—related party   200
Repayment of notes payable—related party   (400)
Net cash provided by financing activities 379,211 44,532
Net increase in cash and cash equivalents 296,190 2,302
Cash and cash equivalents at beginning of period 2,379 77
Cash and cash equivalents at end of period 298,569 2,379
Supplemental disclosures    
Initial recognition of operating lease right-of-use asset and operating lease liability 3,786  
Purchases of property and equipment included in accrued expenses $ 29  
Conversion of convertible notes to convertible preferred shares, including bifurcated conversion liability   271
Conversion of convertible notes to convertible preferred shares, including bifurcated conversion liability - related party   354
Interest paid   $ 24